I'm slightly in the same boat myself, though not really debating all that much. Being relatively on the verge of Legend and feeling like I'm not going to improve all that much with what I have now. Sure, the G20 83+ are on the horizon, but is it really worth it?
I played the July NKF that was from the tips and put up a respectable score. At the same time, the round made it pretty clear that I will need to make some adjustments and clean up my game if I'm going to continue to compete once I get there.
I know the R11s are going to be eons away, especially with the change in level requirement. My suspicion is that I will need to make an upgrade before I get there just so I CAN get there.
My advice - get to the point that your game completely plateaus before making a wholesale club change. You're a long way from having to deal with longer tees, as has been mentioned, so I'd stick with what I got and save up.